Contribution to predicted UV luminosity from the 0th and 1st order terms in Equation (3) as a function of observed redshift for fixed halo mass, M_h = 10¹¹ M_⊙. The contribution from star formation during the halo assembly time (solid) dominates, with the contribution from the earlier star formation epoch (dashed) increasing with redshift. The SFR is constant in both epochs.